Wireless remote control system

ABSTRACT

This invention is concerned essentially with a wireless remote control system embracing a signaling station and a robot or operating station, both jointly and severally, wherein a remotely located signaling station transmits intermittent signals responsive to manual actuation or actuation of a sensor or other control device, and the operating station operates continuously in response to the received intermittent signals, ceasing operation only upon termination of the signals.

United States Patent 11113,569,949

[72] Inventors Roger Isaacs [56] References Cited 953 UNITED STATESPATENTS 6" 3,299,356 1/1967 Bornhorst 325/164X [21] A No 6 3,339,1418/1967 Rothenbuhleketal...... 325/64X P 3,389,223 6/1968 Neiswinteretal.325/164X 221 Filed Feb. 12,1968 [45] Patented Mar91971 3,469,191 9/1969Russell,Jr.,etal... 325/64X 3,427,562 2/1969 Lajoieetal. 331/1113,382,380 /1968 Fish 331/111x 3,475,625 10/1969 Cochran,Jr. 307/265XWIRELESS REMOTE CONTROL SYSTEM 29 Claims, 2 Drawing Figs.

US. Cl. 340/213, 307/239, 307/260, 307/293, 325/133, 325/164, 343/225Int. Cl. G08b 21/00, l-l03k 5/00, l-l03k 17/00 Field of Search 325/105,

64, 392; 340/310, 31 1; 179/84 (SS), 84 (VF); 343/228, 225; 307/239,252, 265, 268, 271, 293; 1 340/147, 213, 224; 325/37, 164, 57,133

Primary Examiner-Donald J. Yusko Anmey- Burton L. Lilling operatescontinuously in response to the received intermittent signals, ceasingoperation only upon termination of the signals.

TO SENSOR OR CONTROL DEVICE PERIODIC veamcmou 7 7/ 1111511 77 TRANSMITTE*5. /04 I06 /07 mmsmrrsa INTERVAL m0 rmsa '95 2 Sheets-Sheet 1 PatentedMarch 9, 1971 ROGER ISAACS ALBERT STERN ZA 76% ATTORNEY Patented March9, 1971 3,569,949

2 Sheets-Sheet 2 ROGER ISAACS S BY firm;

ATTORNEY WIRELESS REMOTE CONTROL SYSTEM BACKGROUND OF THE INVENTION Asis well known to those versed in the art, remote control systems aresubject to certain problems which have not heretofore beensatisfactorily overcome, including that of failsafe operation, and lowpower requirements at the remote station.

SUMMARY Accordingly, it is an important object of the present inventionto provide a wireless remote control system which obviates theabove-mentioned difficulties, effectively achieving continuous operationof the operating station as required, upon intermittent operation of thesignal station so that relatively small power is required by thesignaling station.

It is still another object of the present invention to provide awireless remote control system having the advantageous characteristicsmentioned in the preceding paragraph, which can be used over any desireddistance, the operating station being placed in operation immediatelyupon the receipt of a signal from the signaling station andoperates fora predetermined period of time after which operation ceases in theabsence of a signal from the signaling station and wherein the operatingstation terminates its operation upon the existence of a fault.

Other objects of the present invention will become apparent upon readingthe following specificationand referring to the accompanying drawing,which form a material part of this disclosure.

The invention accordingly consists in the features of construction,combinations of elements, and arrangements of parts, which will beexemplified in the construction hereinafter described, and of which thescope will be indicated by the appended claims.

BRIEF DESCRIPTION OF THE DRAWING F IG. 1 is a schematic representationof a signaling station in accordance with the teachings of the presentinvention; and

FIG. 1a is a continuation of the schematic of FIG. 1 and represents theoperating station of the present invention DESCRIPTION OF THE PREFERREDEMBODIMENT Referring initially to FIG. lathe operating station isconnected to a 3+ or power source by a conductor 50, the other side ofthe power source being connected to ground at 51. A rectifier isgenerally designated 2, and is advantageously a silicon controlledrectifier including an anode 1, cathode 3 and gate 5, the rectifieranode 1 being connected by the conductor 50 to 8+. By the nature ofrectifier 2 any loads connected between the rectifier cathode 3 andground will only be energized when a positive pulse is applied to thegate 5.

A conductor 52 is connected from the rectifier cathode 3 to an intervaltimer circuit, generally designated 8, which is grounded at 4. Inaddition, a control device circuit is generally designated 53 andconnected to the conductor 52 and also to ground at 54. Thus, the timercircuit 8 and control circuit 53 provide loads connected between therectifier cathode 3 and the ground, which loads will be energized fromB+ upon triggering of the rectifier 2 by a positive pulse at gate 5. Theloads 8 and 53 remain energized until the rectifier 2 is turned off.

The control device circuit 53 may include a relay coil 6, connected inparallel with a resistance 7. The parallel connected coil 6 andresistance 7 may be connected by a conductor 9 through the conductor 52to rectifier cathode 3. Relay contacts or switch means are generallydesignated 10, and connected to a system to be controlled. Thus, thecontrol cir cuit 53 is connected between rectifier cathode 3 and ground54 and will operate upon triggering of the rectifier, until therectifier is turned off. The parallelly connected resistor 7 is providedto assure that sufficient current passes through the rectifier 2; inorder to maintain its conductance once it has been fired.

The interval timer circuit 8, also connected between rectifier cathode 3and ground 4 is of the unijunction transistor timing circuit type. Thecircuit 8 includes a series connected resistance 17 and capacitance 18connected together by a conductor 19, with the resistance 17 connectedby a conductor 55 to conductor 52, and capacitor 18 connected by aconductor 20 to the ground 4. Also included in the interval timercircuit is a series connected capacitance-resistance circuit including acapacitance 11 connected by a conductor 25 to a resistor 16, thecapacitor being connected by a conductor 24 to the conductor 52, and theresistor 16 being connected by a conductor 56 to ground 4. Thus, theresistance-capacitor circuit 17,18 may be considered as in parallel withthe capacitor-resistance circuit 11,16, both being connected betweenrectifier cathode 3 and ground.

The interval timer circuit 8 includes a transistor 21 having an emitter57, a base, and a base 23. The emitter 57 is connected to the conductor19 at a juncture 14 between the resistor 17 and capacitor 18. The baselis connected to the conductor 25 at a juncture 58 between thecapacitance 11 and resistance 16, and the base 23 is connected through aresistor 22 to the conductor 24 for connection to the rectifier cathodeIn addition, a diode 12 has its anode connected by a conductor 13 to thejuncture 14 between resistance 17 and the capacitance 18. The cathode ofthe diode 12 is connected by a conductor 40 to a receiver output whichbecomes ground when the receiver output relay is energized.

A conductor 60 is connected to receiver output and becomes plus "whenthe receiver output is energized, being connected through a parallelcapacitance-resistance circuit 30 and conductor 61 to the gate 5 ofrectifier 2. The circuit 30 includes a capacitance 32 connectedinparallel with the resistance 31 to protect the rectifier 2 from acontinuous high value of direct current.

The interval timing circuit 8 generates a positive pulse between itsbase, terminal 15 and ground 4, across the resistor 16. One basic timingelement of the circuit 8 is the resistor 17 connected between therectifier cathode 3 and emitter 57 of the transistor 21. The other basictiming element of the circuit 8 is the capacitance 18 with its positivelead 19 connected to.

the transistor emitter 57 and its negative lead connected to the ground.This provides a series circuit from the rectifier,

cathode 3 with the resistance 17 and capacitance 18, which is.

grounded at its negative lead 20. Upon firing or triggering of therectifier 2, the voltage at the emitter 57 of the transistor 21 beginsto build up according to the resistance-capacitance time constant curveof the components 17 and 18. When the emitter 57 reaches a certainvoltage level, the transistor 21 will conduct in the emitter to base,.Thus, the time required to fire the transistor ,21 is a function of theresistancecapacitance circuit 17,18,so that these values may be selectedto achieve the desired period.

The resistor 16 of the capacitance-resistance circuit 11,16 is connectedto ground, and when the transistor 21 conducts, the capacitance 18 willbe connected through the base, across the resistance 16 causing thecapacitor 18 to discharge. This discharge is the output pulse of theinterval timing circuit 8:

When the capacitor 18 discharges, the emitter voltage isreduced belowits firing level, so that the transistor conduction through base,terminates. Providing voltage is present for the interval timing circuitoperation, the timing cycle and its completion pulse will occurrepeatedly.

The timing circuit 8 also includes a resistor 22 connected between therectifier cathode 3 and base, of transistor 21. This resistor 22protects the transistor 21 from excessive current:

and acts as a temperature compensating element. Its value is chosen inaccordance with safe current limits to achieve the greatest degree oftiming accuracy over a given operation tem.-.

perature range.

In practice, the interval timing circuit 8 may be set for a minute ormore. The capacitance-resistance circuit 11,16 is. selected to build upto full supply voltage immediately, say in one second or less. Thisseries connected capacitance-re;

sistance circuit 11,16 will charge the capacitor 11 to the supplyvoltage almost immediately. At the end of the selected timing intervalof circuit 8, a pulse will appear across the resistor 16, which acts asa voltage in series-aiding with the voltage stored in the capacitor 11,which capacitor voltage is substantially equal to the supply voltage.Therefore, momentarily, there will be a voltage present at the cathode 3of rectitier 2, from the positive side of capacitor 11, which is morepositive than the supply voltage, therefore serving to turn off therectifier 2 and deenergize the control circuit 53.

It will now be understood that the control circuit 53 can be energizedby a low power pulse to the gate 5 of rectifier 2, and once the controlcircuit 53 has been energized the natural holding action of therectifier 2 will maintain the circuit 53 in energized condition.However, the voltage applied to the circuit 53 is also applied to thetiming circuit 8, and after a predetermined interval the timing circuitwill fire and add a positive pulse voltage to the voltage stored incapacitor 11 to momentarily raise the voltage of the rectifier cathode 3above that of the power supply. This turns off the rectifier 2 and thecontrol circuit 53 and timing circuit 8 itself.

As noted hereinbefore, the rectifier gate 5 is energized by a pulse fromthe receiver output through conductor 60 and capacitance-resistanceparallel circuit 30, the latter reducing the value of direct current toprevent damage to the rectifier.

The other receiver output is connected to conductor 40 and isautomatically grounded upon reception of a signal. The diode 12connected to conductor 40 effectively protects the transistor 21 frompositive potential in the receiver. When the cathode of diode 12 becomegrounded, the capacitance 18 is discharged, which action causes thetiming circuit 8 to reset to zero time. As the transmitter transmitspulses at intervals slightly shorter than the time set at the intervaltimer 8, the interval timer will keep being reset to zero time beforethe interval expires, so that the control relay 6 will not bedeenergized so long as a transmitted pulse is received.

Considering now the signaling station of FIG. 1, there are a pair ofconductors or leads 65 and 66 connected across a low impedance sensor oractuator, the conductor 65 being connected to any power supply 64 whichmay be a battery or ordinary house current. In this way, the sensorserves as a main power switch, being interposed between the power supply64 and the remainder of the circuit. That is, a demand for operation atthe operating station is made by lowered or decreased impedance of thesensor, to effectively .connect the signaling station to its relativelysmall power source 64.

It will be appreciated that in one embodiment of this invention thesensor or control device may advantageously be any of a variety ofthermostatically actuated switches.

The conductor 66 is connected to a periodic verification timer or cycletimer generally designated 67 which is connected to ground, as at 68.The periodic verification timer 67 includes a resistance-capacitancecircuit constituted of resistance 69 connected by conductor 70 in serieswith capacitance 71, the resistance being connected to conductor 66 andthe capacitance to ground 68. A transistor 72 includes an emitter 73connected at a juncture 74 to the conductor 70 between resistance 69 andcapacitance 71. A base, 75 is connected by a conductor 76 through aresistance 77 to ground 68, and base2 78 of transistor 72 is connectedby a resistance 79 to conductor 66.

A rectifier 80 includes an anode 81 connected by a conductor 82 to theconductor 66, and includes a cathode 83 and a gate 84. The gate isconnected to the basel of transistor 72 by a conductor 85 through acapacitance-resistance circuit 86 including a capacitance 87 andresistance 88 parallelly connected.

The rectifier 80, which may be a silicon controlled rectifier, has itscathode 83 connected by a conductor 90 to an interval timer circuitgenerally designated 91. ln addition, the cathode 83 of rectifier 80 isalso connected to a transmitter 92, as by a conductor 93 connected toconductor 90. The timer circuit 91 is connected between the rectifiercathode 83 and ground 94,

and the transmitter 92 is connected between the rectifier cathode 83 andground at 115.

The interval timer 91 may be of substantially the same circuitry as theinterval timer 8 described hereinbefore, with components selected toachieve the desired interval of time. The circuit 91 includes: a seriesconnected resistance 95 and capacitance 96, the resistancebeingconnected by conductor 97 through conductor 90 to the rectifiercathode 83, and the capacitance being connected through conductor 98 toground 94; a series connected capacitance-resistance circuit including acapacitance 99 and resistance 100, the capacitance being connected by aconductor 101 to conductor 90 and thence to rectifier cathode 83, andthe resistance being connected through conductor 102 to ground 94; atransistor 103 including an emitter 104 connected at juncture 105between the series connected resistance 95 and capacitance 96. Thetransistor 103 includes a base, 106 connected to a juncture 107 betweenthe series connected capacitance 99 and resistance 100. The transistor103 also includes a base, 108 connected through a resistance 109 to theconductor 101, and thereby to the cathode 83 of rectifier 80.

In operation, actuation of a sensor to lower the impedance thereofplaces the timer circuit 67 on line to the power source 64. This is avery low drain circuit, measured in thousandths of an ampere, and aftera predetermined interval of time, a positive pulse that is developedacross the base, resistor 77 is applied through circuit 86 to rectifiergate 84, causing the rectifier to conduct. Thus, a delay ofpredetermined interval at very low current drainage is required betweenactuation of a sensor and triggering of the rectifier 80. This timercircuit 67 is set for a relatively long period, say more than 15seconds.

Immediately upon conductance or triggering of the rectifier 80, theinterval timer 91 and transmitter 92 are both established as loads onthe power supply. The transmitter commences to transmit a coded signal'for reception by the above-described operating station.

The interval timer circuit 91 operates in the manner describedhereinbefore, for a veryshort duration, say less than 5 seconds, afterwhich it transmits a positive pulse to the cathode 83 of rectifier 80greater than that of the power supplied to effect cessation ofconduction through the rectifier.

Should the demand continue to exist, the timer circuit 67 will onceagain repeat its timing cycle, at the end ofwhich will be triggered therectifier 80, to cause operation of the timer circuit 91 and transmitter92. Thus it will be seen that the transmitter is caused to operate overrelatively short periods determined by the timer circuit 91, whichoperating periods are spaced apart by relatively long periods determinedby the operating constants of circuit 67. This serves to minimize thepower drain at the signaling station; and, as discussed hereinbefore,permits continuous operation at the operating station.

It will also be understood, in the signaling circuit of this invention,that the control device or sensor need only arrive at some minimalresistance value in order to operate the timer circuit .67. As thelatter represents a relatively high impedance, the relatively lowimpedance of the sensor will have little effect on timer operation.However, a lower voltage for the timer will tend to increase its timinginterval, which is advantageous in that more time will be allowed forthe sensor to further reduce its impedance before the transmitter isenergized. Since power is supplied to the transmitter through theimpedance of the sensor, the sensor's impedance should be low in orderto achieve maximum transmitted power.

While the device of this invention has been primarily developed andemployed for use in remotely controlled temperature control apparatus,it is appreciated that the device of this invention is capable of manyvaried applications, all of which are intended to be comprehendedherein.

From the foregoing, it is seen that the wireless remote control systemof this output fully accomplishes its intended objects and is welladapted to meet practical conditions of manu facture, installation anduse.

Although the present invention has been described in some detail by wayof illustration and example for purposes of clarity of understanding, itis understood that certain changes and modifications may be made withinthe spirit of the invention and scope of the appended claims.

We claim:

11. in a wireless remote control system, a signal station comprising: asensor; a first power source connected to the sensor; a first rectifierhaving an anode, cathode and gate with its anode connected to the sensorfor receiving power through the latter; a cycle timer having arelatively long repetition connected to the sensors and gate andoperative only during actuation of the sensor to periodically triggerthe gate; a transmitter connected to the cathode of the rectifier foroperation upon triggering of the rectifier; and an interval timerconnected to the rectifier cathode and transmitter for operation upontriggering of the rectifier, for terminating rectifier and transmitteroperation after a relatively short period; whereby a series ofintermittent signals are transmitted by the transmitter during theactuation of the sensor.

2. A wireless remote control system according to claim 1, said rectifiercomprising a silicon controlled rectifier, and a protectiveresistance-capacitance circuit interposed between said cycle timer andsilicon controlled rectifier.

3. A wireless remote control system according to claim 1, said intervaltimer comprising a unijunction transistor timing circuit.

4. A wireless remote control system according to claim 3, saidunijunction transistor timing circuit comprising a series connectedresistance-capacitance circuit having its resistance connected to saidrectifier cathode and its capacitance connected to ground; a seriesconnected capacitance-resistance circuit having its capacitance.connected to said rectifier cathode and its resistance connected toground; a transistor having an emitter, a basel and a base; with itsemitter connected to said resistance-capacitance circuit betweenresistance and capacitance thereof; the base, being connected to thecapacitance-resistance circuit between its capacitance and resistance;and an additional resistance connected between the base and saidrectifier cathode.

5. A wireless remote control system according to claim 1, in combinationwith a receiver for receiving transmitted signals; a second powersource; a second rectifier having an anode, cathode and gate with itsanode connected to said second power source and its gate connected tosaid receiver for triggering said second rectifier responsive toreceived signal; a control device connected to said second rectifiercathode for energizing a system to be controlled upon triggering of saidsecond rectifier; and a second interval timer connected to said secondrectifier cathode and control device for terminating operation of saidsecond rectifier after predetermined period -in the absence of atransmitted signalduring the predeterground; a transistor having anemitter, a base and a base with its emitter connected to saidresistance-capacitance circuit between the resistance and capacitancethereof; the base being connected to said capacitance-resistance circuitbetween the capacitance and resistance thereof; and a resistanceconnected between the base and said second rectifier cathode.

8. A wireless remote control system according to claim 7 in combinationwith a third rectifier having an anode and cathode with its anodeconnected to said emitter and its cathode switchable to ground.

9. A wireless remote control system according to claim 5, in

combination with'a parallel resistance-capacitance'circuit.

connected between said receiver and gate to minimize direct current.

10. A timer circuit for controlling a rectifier; comprising a seriesconnected resistance-capacitance circuit having the resistance connectedto the rectifier cathode and the capacitance connected to ground; aseries connected capacitance-resistance circuit having its capacitanceconnected to the rectifier cathode and its resistance connected toground; a transistor having an emitter, a base and a base; with itsemitter connected to the resistance-capacitance circuit between theresistance and capacitance thereof; basel being connected to saidcapacitance-resistance circuit between the capacitance and resistancethereof; a resistance connected between the base, and rectifier cathode;a power supply means coupled between the rectifier anode and cathode;and triggering means coupled to the gate of the rectifier.

l1. An operating station for'a wireless remote control system comprisinga receiver for receiving remotely transmitted signals; a power source; arectifier having an anode, cathode and gate with its anode connected tosaid power source and its gate connected to said receiver for triggeringthe rectifier responsive to received signals; a control means connectedto the rectifier cathode for energizing a system to be controlled upontriggering of the rectifier; and an interval timer means connected tosaid rectifier cathode and said control means for automaticallyterminating rectifier operation after a predetermined period in theabsence of a transmitted signal during the predetermined period,interval timer means recycling upon receipt of a transmitted signalduring the predetermined period.

12. An operating station for a wireless remote control system comprisinga receiver for receiving remotely transmitted signals; a power source; arectifier having an anode, cathode and gate with its anode connected tosaid power source and its gate connected to said receiver for triggeringthe rectifier responsive to received signals; a control device connectedto the rectifier cathode for energizing a system to be controlled upontriggering of the rectifier; and an interval timer connected to saidrectifier cathode and control device for terminating rectifier operationafter a predetermined period in the absence of a transmitted signalduring the predetermined period, said interval timer comprising a seriesconnected resistance-capacitance circuit having its resistance connectedto the rectifier cathode and its capacitance connected to the ground; aseries connected capacitance-resistance circuit having its capacitanceconnected to the rectifier cathode and its resistance connected toground; a transistor having an emitter, a base and a base; with itsemitter connected to the resistance-capacitance circuit between theresistance and capacitance thereof; the base, being connected to saidcapacitance-resistance circuit between the capacitance and resistancethereof; and a resistor connected between the base and rectifiercathode.

13. An operating station according to claim 12, in combination with anadditional rectifier having an anode and cathode with its anodeconnected to said emitter and its cathode connected to ground.

14 A wireless remote control system comprising a sensing and signalingstation and a remotely disposed operation station:

said sensing and signaling station comprising electronic sensing means;a source of potential; a transmitter and transmitter actuation means;said electronic sensing means upon detection of a predeterminedcondition being operative to connect said source of potential to saidtransmitter actuation means to activate the same; said transmitteractuation means including a switch means coupled to said transmitter toconnect said source of potential thereto, and a first delay means todelay actuation of said switch means for a predetermined interval oftime after the initial sensing of said predetermined condition byelectronic sensing means; said transmitter, upon activation thereof,generating a signal transmission therefrom; said sensing and signalingstation further comprising a second delay means connected to said switchmeans, said second delay means being operative to inhibit said switchmeans a predetermined time after activation of said switch means by saidfirst delay means to thereby deactuate said transmitter;

said remotely disposed operating station comprising a receiver and anoutput device, said receiver being adapted to receive the signaltransmission from said transmitter, means connecting the output of saidreceiver to said output device, and said receiver being operative uponreception of said signal transmission to couple a signal to said outputdevice to activate the same.

15. A wireless remote control system in accordance with claim 14,wherein said second delay means is activated to commence its timingoperation by said switch means when said switch means is activated.

16. A wireless remote control system in accordance with claim 15,wherein the time delay of said second delay means is shorter than thetime delay of said first delay means.

17. A wireless remote control system in accordance with claim 16,wherein said source of potential is a battery.

18. A wireless remote control system in accordance with claim 15,wherein:

said receiver includes output means for coupling the output thereof tothe output device; and

said output means being operable to maintain said output device in anactivated condition for a predetermined period of time.

19. A wireless remote control system in accordance with claim 18,wherein said output means includes third delay means, said third delaymeans being operable to inactivate said output device a predeterminedinterval of time after activation of said output device in theabsence ofa transmitted signal during said predetermined interval of time.

20. A wireless remote control system in accordance with claim 19,wherein said output meansincludes second switch means. Said secondswitch means being operable to actuate and maintain said output devicein an actuated state.

21. A wireless remote control system in accordance with claim 20,wherein said third delay means is connected to said second switch means,and said third delay means being operable to inhibit said second switchmeans a predetermined interval of time after activation of said secondswitch means to thereby deactuate said output device in the absence of atransmitted signal during said predetermined interval of time.

22. A wireless remote control system in accordance with.

claim 21, wherein said third delay means is activated to commence itstiming operation by said second switch means when said second switchmeans is activated.

23. A wireless remote control system in accordance with claim 22 whereinthe time delay of said third delay means is longer than the time delayof said first and second delay means.

24. A wireless remote control system in accordance with claim 23,wherein said switch means comprises a silicon controlled rectifier.

25. A wireless remote control system in accordance with claim 24,wherein said first time delay means comprises:

a first unijunction transistor having an emitter, a first base and asecond base;

a first resistor and a first capacitor serially connected between oneterminal of said electronic sensing means and a ground terminal, thejunction between said first resistor and said first capacitor beingconnected to said emitter; I

first resistive means interconnected between said one terminal of saidelectronic sensing means and said second base;

second resistive means interconnecting said first base and ground;and

coupling means connecting said first base to said silicon controlledrectifier. I 26. A wireless remote control system in accordance withclaim 25, wherein, said second delay means comprises:

a second unijunction transistor having an emitter, a first base and asecond base; 7

a second resistor and a second capacitor serially connected between saidsilicon controlled rectifier and a ground terminal, the junction betweensaid second resistor and said second capacitor being connected to saidemitter of said second unijunction transistor;

a third capacitor and a third resistor serially connected between saidsilicon controlled rectifier and said ground terminal, the junctionbetween said third capacitor and said third resistor being connected tosaid first base of said second unijunction transistor, and

third resistive means interconnecting said second base of said secondunijunction transistor and said silicon controlled rectifier.

27. A wireless remote control system in accordance with claim 26,wherein said second switch means comprises a second silicon controlledrectifier.

28. A wireless remote control system in accordance with claim 26,wherein said third delay means comprises:

a third unijunction transistor having an emitter, a first base,

and a second base;

a fourth resistor and a fourth capacitor serially connected between saidsecond silicon controlled rectifier and a ground terminal, the junctionbetween said fourth resistor and said fourth capacitor being connectedto said emitter of said third unijunction transistor;

a fifth capacitor and a fifth resistor serially connected between saidsecond silicon controlled rectifier and said ground terminal, thejunction between said fifth capacitor and said fifth resistor beingconnected to said first base of said third unijunction transistor; and

fourth resistive means interconnecting said second base of said thirdunijunction transistor and said second silicon controlled rectifier.

29. A wireless remote control system in accordance with claim 28 whereinsaid output means includes relay means interconnected between saidsilicon controlled rectifier and said output device, said relay devicebeing operative to maintain said output device in an actuated conditionwhen said silicon controlled rectifier is maintained in an activatedcondition.

1. In a wireless remote control system, a signal station comprising: asensor; a first power source connected to the sensor; a first rectifierhaving an anode, cathode and gate with its anode connected to the sensorfor receiving power through the latter; a cycle timer having arelatively long repetition connected to the sensors and gate andoperative only during actuation of the sensor to periodically triggerthe gate; a transmitter connected to the cathode of the rectifier foroperation upon triggering of the rectifier; and an interval timerconnected to the rectifier cathode and transmitter for operation upontriggering of the rectifier, for terminating rectifier and transmitteroperation after a relatively short period; whereby a series ofintermittent signals are transmitted by the transmitter during theactuation of the sensor.
 2. A wireless remote control system accordingto claim 1, said rectifier comprising a silicon controlled rectifier,and a protective resistance-capacitance circuit interposed between saidcycle timer and silicon controlled rectifier.
 3. A wireless remotecontrol system according to claim 1, said interval timer comprising aunijunction transistor timing circuit.
 4. A wireless remote controlsystem according to claim 3, said unijunction transistor timing circuitcomprising a series connected resistance-capacitance circuit having itsresistance connected to said rectifier cathode and its capacitanceconnected to ground; a series connectEd capacitance-resistance circuithaving its capacitance connected to said rectifier cathode and itsresistance connected to ground; a transistor having an emitter, a base1and a base2 with its emitter connected to said resistance-capacitancecircuit between resistance and capacitance thereof; the base1 beingconnected to the capacitance-resistance circuit between its capacitanceand resistance; and an additional resistance connected between the base2and said rectifier cathode.
 5. A wireless remote control systemaccording to claim 1, in combination with a receiver for receivingtransmitted signals; a second power source; a second rectifier having ananode, cathode and gate with its anode connected to said second powersource and its gate connected to said receiver for triggering saidsecond rectifier responsive to received signal; a control deviceconnected to said second rectifier cathode for energizing a system to becontrolled upon triggering of said second rectifier; and a secondinterval timer connected to said second rectifier cathode and controldevice for terminating operation of said second rectifier afterpredetermined period in the absence of a transmitted signal during thepredetermined period.
 6. A wireless remote control system according toclaim 5, said second interval timer comprising a unijunction transistortiming circuit.
 7. A wireless remote control system according to claim6, said unijunction transistor timing circuit comprising a seriesconnected resistance-capacitance circuit having its resistance connectedto said second rectifier cathode and its capacitance connected toground; a series connected capacitance-resistance circuit having itscapacitance connected to said second rectifier cathode and itsresistance connected to ground; a transistor having an emitter, a base1and a base2 with its emitter connected to said resistance-capacitancecircuit between the resistance and capacitance thereof; the base1 beingconnected to said capacitance-resistance circuit between the capacitanceand resistance thereof; and a resistance connected between the base2 andsaid second rectifier cathode.
 8. A wireless remote control systemaccording to claim 7 in combination with a third rectifier having ananode and cathode with its anode connected to said emitter and itscathode switchable to ground.
 9. A wireless remote control systemaccording to claim 5, in combination with a parallelresistance-capacitance circuit connected between said receiver and gateto minimize direct current.
 10. A timer circuit for controlling arectifier; comprising a series connected resistance-capacitance circuithaving the resistance connected to the rectifier cathode and thecapacitance connected to ground; a series connectedcapacitance-resistance circuit having its capacitance connected to therectifier cathode and its resistance connected to ground; a transistorhaving an emitter, a base1 and a base2 with its emitter connected to theresistance-capacitance circuit between the resistance and capacitancethereof; base1 being connected to said capacitance-resistance circuitbetween the capacitance and resistance thereof; a resistance connectedbetween the base2 and rectifier cathode; a power supply means coupledbetween the rectifier anode and cathode; and triggering means coupled tothe gate of the rectifier.
 11. An operating station for a wirelessremote control system comprising a receiver for receiving remotelytransmitted signals; a power source; a rectifier having an anode,cathode and gate with its anode connected to said power source and itsgate connected to said receiver for triggering the rectifier responsiveto received signals; a control means connected to the rectifier cathodefor energizing a system to be controlled upon triggering of therectifier; and an interval timer means connected to said rectifiercathode and said control means for automatically terminating rectifieropEration after a predetermined period in the absence of a transmittedsignal during the predetermined period, interval timer means recyclingupon receipt of a transmitted signal during the predetermined period.12. An operating station for a wireless remote control system comprisinga receiver for receiving remotely transmitted signals; a power source; arectifier having an anode, cathode and gate with its anode connected tosaid power source and its gate connected to said receiver for triggeringthe rectifier responsive to received signals; a control device connectedto the rectifier cathode for energizing a system to be controlled upontriggering of the rectifier; and an interval timer connected to saidrectifier cathode and control device for terminating rectifier operationafter a predetermined period in the absence of a transmitted signalduring the predetermined period, said interval timer comprising a seriesconnected resistance-capacitance circuit having its resistance connectedto the rectifier cathode and its capacitance connected to the ground; aseries connected capacitance-resistance circuit having its capacitanceconnected to the rectifier cathode and its resistance connected toground; a transistor having an emitter, a base1 and a base2 with itsemitter connected to the resistance-capacitance circuit between theresistance and capacitance thereof; the base1 being connected to saidcapacitance-resistance circuit between the capacitance and resistancethereof; and a resistor connected between the base2 and rectifiercathode.
 13. An operating station according to claim 12, in combinationwith an additional rectifier having an anode and cathode with its anodeconnected to said emitter and its cathode connected to ground. 14 Awireless remote control system comprising a sensing and signalingstation and a remotely disposed operation station: said sensing andsignaling station comprising electronic sensing means; a source ofpotential; a transmitter and transmitter actuation means; saidelectronic sensing means upon detection of a predetermined conditionbeing operative to connect said source of potential to said transmitteractuation means to activate the same; said transmitter actuation meansincluding a switch means coupled to said transmitter to connect saidsource of potential thereto, and a first delay means to delay actuationof said switch means for a predetermined interval of time after theinitial sensing of said predetermined condition by electronic sensingmeans; said transmitter, upon activation thereof, generating a signaltransmission therefrom; said sensing and signaling station furthercomprising a second delay means connected to said switch means, saidsecond delay means being operative to inhibit said switch means apredetermined time after activation of said switch means by said firstdelay means to thereby deactuate said transmitter; said remotelydisposed operating station comprising a receiver and an output device,said receiver being adapted to receive the signal transmission from saidtransmitter, means connecting the output of said receiver to said outputdevice, and said receiver being operative upon reception of said signaltransmission to couple a signal to said output device to activate thesame.
 15. A wireless remote control system in accordance with claim 14,wherein said second delay means is activated to commence its timingoperation by said switch means when said switch means is activated. 16.A wireless remote control system in accordance with claim 15, whereinthe time delay of said second delay means is shorter than the time delayof said first delay means.
 17. A wireless remote control system inaccordance with claim 16, wherein said source of potential is a battery.18. A wireless remote control system in accordance with claim 15,wherein: said receiver includes output means for coupling the outputthereof to the output device; and said output means being operable tomaintain said output device in an activated condition for apredetermined period of time.
 19. A wireless remote control system inaccordance with claim 18, wherein said output means includes third delaymeans, said third delay means being operable to inactivate said outputdevice a predetermined interval of time after activation of said outputdevice in the absence of a transmitted signal during said predeterminedinterval of time.
 20. A wireless remote control system in accordancewith claim 19, wherein said output means includes second switch means.Said second switch means being operable to actuate and maintain saidoutput device in an actuated state.
 21. A wireless remote control systemin accordance with claim 20, wherein said third delay means is connectedto said second switch means, and said third delay means being operableto inhibit said second switch means a predetermined interval of timeafter activation of said second switch means to thereby deactuate saidoutput device in the absence of a transmitted signal during saidpredetermined interval of time.
 22. A wireless remote control system inaccordance with claim 21, wherein said third delay means is activated tocommence its timing operation by said second switch means when saidsecond switch means is activated.
 23. A wireless remote control systemin accordance with claim 22 wherein the time delay of said third delaymeans is longer than the time delay of said first and second delaymeans.
 24. A wireless remote control system in accordance with claim 23,wherein said switch means comprises a silicon controlled rectifier. 25.A wireless remote control system in accordance with claim 24, whereinsaid first time delay means comprises: a first unijunction transistorhaving an emitter, a first base and a second base; a first resistor anda first capacitor serially connected between one terminal of saidelectronic sensing means and a ground terminal, the junction betweensaid first resistor and said first capacitor being connected to saidemitter; first resistive means interconnected between said one terminalof said electronic sensing means and said second base; second resistivemeans interconnecting said first base and ground; and coupling meansconnecting said first base to said silicon controlled rectifier.
 26. Awireless remote control system in accordance with claim 25, wherein,said second delay means comprises: a second unijunction transistorhaving an emitter, a first base and a second base; a second resistor anda second capacitor serially connected between said silicon controlledrectifier and a ground terminal, the junction between said secondresistor and said second capacitor being connected to said emitter ofsaid second unijunction transistor; a third capacitor and a thirdresistor serially connected between said silicon controlled rectifierand said ground terminal, the junction between said third capacitor andsaid third resistor being connected to said first base of said secondunijunction transistor, and third resistive means interconnecting saidsecond base of said second unijunction transistor and said siliconcontrolled rectifier.
 27. A wireless remote control system in accordancewith claim 26, wherein said second switch means comprises a secondsilicon controlled rectifier.
 28. A wireless remote control system inaccordance with claim 26, wherein said third delay means comprises: athird unijunction transistor having an emitter, a first base, and asecond base; a fourth resistor and a fourth capacitor serially connectedbetween said second silicon controlled rectifier and a ground terminal,the junction between said fourth resistor and said fourth capacitorbeing connected to said emitter of said third unijunction transistor; afifth capacitor and a fifth resistor serially connected between saidsecond silicon controlled rectifier and said ground terminal, thejunction between said fifth caPacitor and said fifth resistor beingconnected to said first base of said third unijunction transistor; andfourth resistive means interconnecting said second base of said thirdunijunction transistor and said second silicon controlled rectifier. 29.A wireless remote control system in accordance with claim 28 whereinsaid output means includes relay means interconnected between saidsilicon controlled rectifier and said output device, said relay devicebeing operative to maintain said output device in an actuated conditionwhen said silicon controlled rectifier is maintained in an activatedcondition.